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Which of the following statements is correct?
  • a)
    Temporary hardness of water can be removed by boiling.
  • b)
    Permanent hardness of water can be removed by boiling.
  • c)
    Temporary and permanent hardness of water can be removed by boiling.
  • d)
    Neither temporary nor permanent hardness of water can be removed by boiling.
Correct answer is option 'A'. Can you explain this answer?
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Verified Answer
Which of the following statements is correct?a)Temporary hardness of w...
Tempo​rary hardness: It is due to the presence of soluble bicarbonates of calcium and magnesium. It can be removed by boiling. During boiling, the soluble Mg(HCO3)2 present in water is converted into insoluble Mg(OH)2 and Ca(HCO3)2 is changed to insoluble CaCO3 which settle at the bottom as precipitates. These precipitates can be removed by filtration. Filtrate thus obtained will be soft water.
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Which of the following statements is correct?a)Temporary hardness of w...
Read ncert ,temporary hardness can remove by boiling but permanent cant ....
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Which of the following statements is correct?a)Temporary hardness of w...
Explanation:




Temporary hardness of water:
Temporary hardness of water is caused by the presence of dissolved calcium bicarbonate (Ca(HCO3)2) and magnesium bicarbonate (Mg(HCO3)2) ions in water. When water with temporary hardness is heated, the bicarbonate ions decompose to form insoluble calcium carbonate (CaCO3) and magnesium carbonate (MgCO3) precipitates. These precipitates can be easily removed by filtration or by boiling the water.




Permanent hardness of water:
Permanent hardness of water is caused by dissolved calcium sulfate (CaSO4) and magnesium sulfate (MgSO4) ions. Unlike temporary hardness, these ions cannot be removed by boiling because they do not decompose or form precipitates. Therefore, boiling does not remove permanent hardness from water.




Explanation of the given options:




a) Temporary hardness of water can be removed by boiling.
- This statement is correct because boiling causes the bicarbonate ions responsible for temporary hardness to decompose and form insoluble precipitates, which can then be removed.




b) Permanent hardness of water can be removed by boiling.
- This statement is incorrect because boiling does not remove permanent hardness. The dissolved calcium sulfate and magnesium sulfate ions responsible for permanent hardness do not decompose or form precipitates upon boiling.




c) Temporary and permanent hardness of water can be removed by boiling.
- This statement is incorrect because while boiling can remove temporary hardness, it cannot remove permanent hardness.




d) Neither temporary nor permanent hardness of water can be removed by boiling.
- This statement is incorrect because boiling can remove temporary hardness, but not permanent hardness.




Conclusion:
The correct statement is a) Temporary hardness of water can be removed by boiling.
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Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those can't stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Which of the following statement is false?

Attempt All Questions sub parts from each question.Elasticity vs. plasticity: Objects get deformed when pushed, pulled, and twisted. Elasticity is the measure of the amount that the object can return to its original shape after these external forces and pressure are removed. The opposite of elasticity is plasticity. When something is stretched, and it stays stretched, the material is said to be plastic. Such deformation is said to be plastic deformation. In elastic deformation, atoms of the material are displaced temporarily from their original lattice site. They return back to their original position after the removal of external force. In plastic deformation, atoms of the solid are displaced permanently from their original lattice site. They don’t return back to the original position even after the removal of external load. So, elastic deformation is temporary, whereas plastic deformation is permanent. Amount of elastic deformation is very small. But the amount of plastic deformation is quite large. External force required for elastic deformation of solid is quite small. Force required for plastic deformation is much higher. Total energy absorbed by the material during elastic and plastic deformation region is called modulus of toughness. Energy absorbed by the material during elastic deformation is called module of resilience. Most materials have an amount of force or pressure for which they deform elastically. If more force or pressure is applied, then they undergo plastic deformation. Materials those have a fair amount of plastic deformation before breaking are said to be ductile. Materials those cant stretch or bend much without breaking are said to be brittle. Copper, aluminium etc. are ductile materials. For this reason those are used for making wires. Glass and ceramics are often brittle; they will not bend; they will break.Q. Which of the following 4 stress-strain graphs represent a ductile material and a brittle material?

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Which of the following statements is correct?a)Temporary hardness of water can be removed by boiling.b)Permanent hardness of water can be removed by boiling.c)Temporary and permanent hardness of water can be removed by boiling.d)Neither temporary nor permanent hardness of water can be removed by boiling.Correct answer is option 'A'. Can you explain this answer?
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Which of the following statements is correct?a)Temporary hardness of water can be removed by boiling.b)Permanent hardness of water can be removed by boiling.c)Temporary and permanent hardness of water can be removed by boiling.d)Neither temporary nor permanent hardness of water can be removed by boiling.Correct answer is option 'A'. Can you explain this answer? for Class 11 2024 is part of Class 11 preparation. The Question and answers have been prepared according to the Class 11 exam syllabus. Information about Which of the following statements is correct?a)Temporary hardness of water can be removed by boiling.b)Permanent hardness of water can be removed by boiling.c)Temporary and permanent hardness of water can be removed by boiling.d)Neither temporary nor permanent hardness of water can be removed by boiling.Correct answer is option 'A'. Can you explain this answer? covers all topics & solutions for Class 11 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for Which of the following statements is correct?a)Temporary hardness of water can be removed by boiling.b)Permanent hardness of water can be removed by boiling.c)Temporary and permanent hardness of water can be removed by boiling.d)Neither temporary nor permanent hardness of water can be removed by boiling.Correct answer is option 'A'. Can you explain this answer?.
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